release todo:
- merge infinite wav header generator

speed detection possible improvements:
- would n-best search make detect-speed-patient better?
- refine with 128 sync step instead of 256?
- detect silence instead of total volume?
- split big region into two smaller ones?
- connected search on even smaller regions?

possible improvements:
- dynamic bit strength

videowmark:
opus length ffprobe -show_format phil.mkv
